public class QuantifiedExpression extends Assignation
action, requiredType, sequence, slotNumber, variableNameEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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QuantifiedExpression() |
| Modifier and Type | Method and Description |
|---|---|
void |
checkForUpdatingSubexpressions()
Check to ensure that this expression does not contain any updating subexpressions.
|
int |
computeCardinality()
Determine the static cardinality
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int |
computeSpecialProperties()
Determine the special properties of this expression
|
Expression |
copy()
Copy an expression.
|
boolean |
effectiveBooleanValue(XPathContext context)
Get the result as a boolean
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BooleanValue |
evaluateItem(XPathContext context)
Evaluate the expression to return a singleton value
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
|
ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the QuantifiedExpression expression
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String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user.
|
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression
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int |
getOperator()
Get the operator, either
Token.SOME or Token.EVERY |
int |
getStreamability(int syntacticContext,
boolean allowExtensions,
List<String> reasons)
Get the "sweep" of this expression as defined in the W3C streamability specifications.
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boolean |
isUpdatingExpression()
Determine whether this is an updating expression as defined in the XQuery update specification
|
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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void |
setOperator(int operator)
Set the operator, either
Token.SOME or Token.EVERY |
String |
toString()
The toString() method for an expression attempts to give a representation of the expression
in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath.
|
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression
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addReference, addToPathMap, evaluateVariable, extendBindingList, getAction, getIntegerBoundsForVariable, getLocalSlotNumber, getNominalReferenceCount, getObjectName, getRequiredSlots, getRequiredType, getSequence, getVariableEQName, getVariableName, getVariableQName, hasVariableBinding, isAssignable, isGlobal, isIndexedVariable, iterateSubExpressionInfo, iterateSubExpressions, promote, refineTypeInformation, replaceSubExpression, replaceVariable, setAction, setIndexedVariable, setRequiredType, setSequence, setSlotNumber, setVariableQName, simplify, suppressValidationadoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamingAdjunct, getSystemId, getSystemId, implementsStaticTypeCheck, isSubtreeExpression, isVacuousExpression, iterate, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, toPattern, toStreamingPattern, typeErrorpublic String getExpressionName()
getExpressionName in class Expressionpublic void setOperator(int operator)
Token.SOME or Token.EVERYoperator - the operatorpublic int getOperator()
Token.SOME or Token.EVERYpublic int computeCardinality()
computeCardinality in class ExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public void checkForUpdatingSubexpressions()
throws XPathException
checkForUpdatingSubexpressions in class AssignationXPathException - if the expression has a non-permitted updateing subexpressionpublic boolean isUpdatingExpression()
isUpdatingExpression in class Assignationpublic Expression copy()
copy in class Expressionpublic int computeSpecialProperties()
computeSpecialProperties in class ExpressionStaticProperty.NON_CREATIVE.public int getStreamability(int syntacticContext,
boolean allowExtensions,
List<String> reasons)
getStreamability in class ExpressionsyntacticContext - one of the values Expression.NAVIGATION_CONTEXT,
Expression.NODE_VALUE_CONTEXT, Expression.INHERITED_CONTEXT, Expression.INSPECTION_CONTEXTallowExtensions - if false, the definition of "guaranteed streamability" in the
W3C specification is used. If true, Saxon extensions are permitted, which make somereasons - the caller may supply a list, in which case the implementation may add to this
list a message explaining why the construct is not streamable, suitable for inclusion in an
error message.Expression.W3C_MOTIONLESS, Expression.W3C_CONSUMING,
Expression.W3C_GROUP_CONSUMING, Expression.W3C_FREE_RANGINGpublic BooleanValue evaluateItem(XPathContext context) throws XPathException
evaluateItem in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cachepublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionpublic String toString()
toString in class Expressionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structureCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.